Some individuals experience situations in which a sensory stimulus such as a sound, smell, taste or vision of a specific image causes the clear and immediate reaction of another sense. These situations are commonly referred to with the term synaesthesia, a perceptual phenomenon in the course of which a single sensation manifests itself through the combination of two or more sensory modalities. The most frequent combination is represented by the correlation between letters or numbers with colors, an association that manifests itself mentally, in a direct and automatic way, whenever the graphemes are observed, read or even just imagined.Taking a cue from this simple reality and through a succession of small passages which, however logical and rational, leave free rein to the imagination, the reader is guided in the construction of a new world, in which numbers and colors appear as inseparable entities and within which the ideas that populate the mathematician's mind are now accompanied by the movements of the painter's hand on the palette and on the painting.Simple daily operations are transformed into colorful shades between infinitely pure tones.
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